Thank you. I have worked with for years, had presented to me every year through an annual safety course and even tested every year on my knowledge of proper lockout methods.
But until your post it never entered my mind to put a lockout on the Main Breaker in my own home. I'm going to get a 'lockout' for the Main Breaker. It will prevent others not knowledgeable about what's going on, from turning on the breaker. And it will be a reminder to me to make sure everything is properly prepared, prior to turning the Main Breaker back on.
Here's a link to what I searched for and found after reading your reply:
http://www.lockoutstore.com/stopout-double-pole-circuit-breaker-lockout-kdd161.html
thank you
paul
edit: I have come to the conclusion because of help on here a >"Transfer Switch"< is the ONLY way to go.
I am going to have a "Transfer Switch" installed and will also "Lockout" the Main Breaker until utility power is properly restored. I'm thinking now when using a Transfer Switch, to protect your house until you know power is properly restored, it would be a good idea to lockout the Main Breaker in the Off position. I think it would be a good idea even though in theory and practice it's not required.